/* ============================================
   The Bach Academy - Site Header Component
   ============================================

   A reusable, role-aware header component that provides:
   - Site branding with logo
   - Role-based navigation links
   - Login/account state display
   - Mobile-responsive design

   ============================================ */

@import url('tokens.css');

/* ========================================
   Site Header - Main Container
   ======================================== */
.site-header {
    background-color: var(--color-primary);
    color: var(--color-white);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-md);
}

.site-header__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

/* ========================================
   Site Header - Branding (Logo + Title)
   ======================================== */
.site-header__brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    color: var(--color-white);
    flex-shrink: 0;
}

.site-header__brand:hover {
    color: var(--color-white);
    opacity: 0.95;
}

.site-header__logo {
    height: 48px;
    width: auto;
    display: block;
}

.site-header__logo--placeholder {
    /* Placeholder styling when no logo image is provided */
    display: none;
}

.site-header__title-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.site-header__title {
    font-family: var(--font-primary);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin: 0;
    line-height: 1.2;
}

.site-header__tagline {
    font-size: var(--font-size-xs);
    opacity: 0.85;
    margin: 0;
    font-weight: var(--font-weight-normal);
}

/* ========================================
   Site Header - Navigation
   ======================================== */
.site-header__nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.site-header__nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-header__nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-white);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast), opacity var(--transition-fast);
    white-space: nowrap;
}

.site-header__nav-link:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: var(--color-white);
}

.site-header__nav-link--active {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Hide navigation items based on role */
.site-header__nav-item[data-role] {
    display: none;
}

/* Role-specific visibility - controlled by JS adding classes to body or header */
[data-user-role="customer"] .site-header__nav-item[data-role~="customer"],
[data-user-role="teacher"] .site-header__nav-item[data-role~="teacher"],
[data-user-role="admin"] .site-header__nav-item[data-role~="admin"],
.site-header__nav-item[data-role~="all"] {
    display: flex;
}

/* Public nav items (shown when not logged in) */
.site-header__nav-item[data-role="public"] {
    display: flex;
}

[data-user-role] .site-header__nav-item[data-role="public"] {
    display: none;
}

/* ========================================
   Site Header - Account Section
   ======================================== */
.site-header__account {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-left: var(--spacing-md);
    padding-left: var(--spacing-md);
    border-left: 1px solid rgba(255, 255, 255, 0.2);
}

.site-header__user {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.site-header__avatar {
    width: var(--size-avatar-sm);
    height: var(--size-avatar-sm);
    border-radius: var(--radius-full);
    background-color: var(--color-accent);
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
}

.site-header__user-name {
    font-weight: var(--font-weight-medium);
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.site-header__user-role {
    font-size: var(--font-size-xs);
    opacity: 0.75;
    text-transform: capitalize;
}

/* Account buttons */
.site-header__btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    border: none;
    font-family: var(--font-secondary);
}

.site-header__btn--login {
    background-color: transparent;
    border: 1px solid rgba(255, 255, 255, 0.5);
    color: var(--color-white);
}

.site-header__btn--login:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--color-white);
    color: var(--color-white);
}

.site-header__btn--logout {
    background-color: rgba(255, 255, 255, 0.15);
    color: var(--color-white);
}

.site-header__btn--logout:hover {
    background-color: rgba(255, 255, 255, 0.25);
}

/* ========================================
   Site Header - Guest vs Authenticated States
   ======================================== */
.site-header__guest,
.site-header__authenticated {
    display: none;
}

/* Show guest section when not authenticated */
.site-header:not([data-authenticated]) .site-header__guest,
.site-header[data-authenticated="false"] .site-header__guest {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Show authenticated section when logged in */
.site-header[data-authenticated="true"] .site-header__authenticated {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* ========================================
   Site Header - Mobile Menu Toggle
   ======================================== */
.site-header__menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-white);
    padding: var(--spacing-sm);
    cursor: pointer;
    border-radius: var(--radius-sm);
}

.site-header__menu-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.site-header__menu-icon {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 24px;
}

.site-header__menu-icon span {
    display: block;
    height: 2px;
    background-color: currentColor;
    border-radius: 1px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* Menu open state */
.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-icon span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-icon span:nth-child(2) {
    opacity: 0;
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-icon span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Responsive Styles
   ======================================== */

/* Tablet and smaller */
@media (max-width: 768px) {
    .site-header__container {
        flex-wrap: wrap;
        padding: var(--spacing-sm) var(--container-padding);
    }

    .site-header__menu-toggle {
        display: flex;
        order: 3;
    }

    .site-header__nav {
        order: 4;
        width: 100%;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding-top: var(--spacing-md);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        margin-top: var(--spacing-sm);
    }

    .site-header__nav--open {
        display: flex;
    }

    .site-header__nav-list {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
    }

    .site-header__nav-link {
        justify-content: flex-start;
        padding: var(--spacing-md);
        border-radius: var(--radius-sm);
    }

    .site-header__account {
        order: 2;
        border-left: none;
        margin-left: auto;
        padding-left: 0;
    }

    .site-header__user-name,
    .site-header__user-role {
        display: none;
    }

    .site-header__logo {
        height: 40px;
    }

    .site-header__title {
        font-size: var(--font-size-base);
    }

    .site-header__tagline {
        display: none;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .site-header__account {
        gap: var(--spacing-sm);
    }

    .site-header__btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-xs);
    }

    .site-header__logo {
        height: 36px;
    }
}

/* ========================================
   Loading State
   ======================================== */
.site-header--loading .site-header__account {
    opacity: 0.5;
    pointer-events: none;
}

.site-header--loading .site-header__nav {
    opacity: 0.7;
}